The current developers and support team of PHD2 strongly recommend Ascom Pulse Guiding ( cable straight from laptop to guide camera ) in lieu of the old method ST4 Guiding ( guide camera to mount )
This eliminates many issues that may arise during guiding , one of which could possibly be your issue !!
I can send you some important information including a procedures and check list which I put together for PHD2 guiding which may be useful in getting you guiding successfully
Let me know !
Cheers
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